Dr. Ittay Eyal from the Department of Computer Science at Cornell University came to visit Innsbruck at the beginning of April. He held a lecture on Blockchain-based cryptocurrencies, their limitations and overcoming some of those challenges. Dr. Eyal was invited by Prof. Böhme from the Department of Computer Science at University of Innsbruck to work on a joint project. The Guest Lecture received great interest and Dr. Eyal answered many questions from the audience within and after his talk during a small reception that was organized by the Department of Computer Science.